SDF, which comprises Kurdish and Arab fighters backed by a US-led coalition group, entered the city in June marking a vital phase in their fight to liberate Raqqa. Syrian government forces backed by Russia are also fighting the Islamist militant group, attacking them from another direction.

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SDF calls the operation Euphrates Wrath campaign, under which they also liberated other Isis-held towns in Syria. The militant group lost a large part of their territories in the country in the past few months to SDF as well as the Syrian army.

Meanwhile, the UK-based Syrian Observatory for Human Rights reported on Wednesday that the jihadist group has collapsed along the west bank of the Euphrates downstream of Raqqa following a fight with President Bashar al-Assad's army. It added that Isis only has 5% of Raqqa under control and that their remaining fighters have almost run out of food and ammunition supplies.

The observatory added that the Syrian army reached Raqqa's provincial border on Wednesday after capturing about 100km of the west bank of the Euphrates in September.

Syrian Democratic Forces (SDF) said on Wednesday, 20 September that they have liberated 80% of Raqqa city in Syria and the battle is in its "final stages" - File photoReuters

Both SDF and the Syrian army are also fighting the militant group separately in another Syrian city, Deir al-Zor.